Rotary vacuum filtration washing efficiency

Potdar et al. (2005) also presented a general work up procedure for recycling of ILs The reaction mixture was quenched with 10% aqueous NaOH solution and settled. The settled down IL was extracted with dichloromethane. Further, the dichloromethane layer was stirred vigorously with 10% aqueous NaOH in order to remove coumarin and acid traces. Further, dichloromethane layer was washed with water. The solvent was then evaporated and the resultant IL was subjected to consecutive extractions with diethyl ether to remove any organic impurities present. The resultant IL was then dried under vacuum at 60 °C and reused for subsequent reactions. When the IL [bmim]BF4 was used, the reaction mixture was quenched by addition of water. The coumarin derivative separated as a solid was isolated by filtration. The IL was recovered by evaporation of water in a rotary evaporator. The above ILs have been reused for consecutive four cycles without loss in their efficiency [Potdar et al., 2005]. 

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